Monitor



FIG. 1 is a back, top, side perspective view of the monitor, showing, in particular the ornamental design thereof;

FIG. 2 is a front, top perspective view thereof;

FIG. 3 is a back, top perspective view thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a monitor, as shown. 